Self-enhancement of the critical current of YBa2Cu3O7−x coated conductors caused by the axial tension

We have measured the critical current of the YaBa2Cu3O7−x coated conductor under an axial tension. In the case of liquid nitrogen temperature and self-field ambient, a fascinating self-enhancement (about 25%) of the critical current of the specimens after the axial tension and a suitable waiting time were observed in the experiments. A theoretical model based on the waiting time and the tension strain is presented, which quantitatively agrees with the experimental results very well.